Internationalization - Web Standards: Mastering HTML5, CSS3, and XML - page 41

Table 2-3. Unicode Characters Not Suitable for Markup [8]

Codepoint(s) Description Comment

U+0340 .. U+0341 Clones of grave and accent Deprecated in Unicode.

U+17A3 , U+17D3 Obsolete characters for Khmer Deprecated in Unicode.

U+2028 .. U+2029 <xhtml:br /> , <xhtml:p></xhtml:p> , or

equivalent should be used instead.

Line and paragraph separator

U+202A .. U+202E BIDI (bidirectional) embedding controls

(LRE, RLE, LRO, RLO, PDF)

Strongly discouraged in HTML 4.01.

U+206A .. U+206B Activate/Inhibit Symmetric swapping Deprecated in Unicode.

U+206C .. U+206D Activate/Inhibit Arabic form shaping Deprecated in Unicode.

U+206E .. U+206F Activate/Inhibit National digit shapes Deprecated in Unicode.

U+FFF9 .. U+FFFB Interlinear annotation characters Ruby markup should be used instead.

U+FEFF U+2060 word joiner should be used instead.

As ZWNBSP

As Byte Order Mark Use only at the start of a file, not as part of markup.

U+FFFC Markup should be used instead, e.g., <object> , <img> . Object replacement character

U+1D173 .. U+1D17A Scoping for Musical Notation An appropriate markup language should be

used instead.

U+E0000 .. U+E007F xhtml:lang or xml:lang should be used instead.

Language Tag code points

Formatting Characters Suitable Also for Markup
There are special formatting characters in Unicode that can also be used in markup languages (see Table 2-4 ).
They affect text and can be applied for markup simultaneously. These formatting characters are interpreted by
rendering engines.